METHOD FOR PRODUCING OPTICAL FIBER STRAND

• Main Authors: KASAHARA MINORU, UI KEISUKE, MOCHIZUKI KOJI, SAITO MINORU, NAKAJIMA YASUO, TANAKA HIROKI
• Format: Patent
• Language: English
• Published: 09.02.2012
• Subjects: CHEMICAL COMPOSITION OF GLASSES, GLAZES, OR VITREOUSENAMELS; CHEMISTRY; GLASS; JOINING GLASS TO GLASS OR OTHER MATERIALS; METALLURGY; MINERAL OR SLAG WOOL; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; PHYSICS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS,MINERALS OR SLAGS; SURFACE TREATMENT OF GLASS

PROBLEM TO BE SOLVED: To provide a method for stably producing an optical fiber strand over a long period by a simple device and simple control.SOLUTION: The method for producing an optical fiber strand 4, wherein the outer circumference of a filament body 3 is coated with ultraviolet-curing resin, includes: a wire drawing process for drawing an optical fiber base material 1 into the filament body 3; an application process for applying the ultraviolet-curing resin to the filament body 3; and an irradiation process for irradiating the filament body 4 coated with the ultraviolet-curing resin by two or more ultraviolet radiation devices 6a and 6b. The ultraviolet-curing resin contains an acrylic monomer and a monomer including an N-vinyl group. In the irradiation process, the filament body 4 is irradiated with ultraviolet rays while passed through the inside of ultraviolet transmissive cylinder bodies inside the two or more ultraviolet radiation devices 6a and 6b, and the temperature of the ultraviolet transmissive cylinder body on the downstream side is kept at 70-180°C while at least the ultraviolet radiation device 6a on the upstream side is turned on among the optional adjacent two ultraviolet radiation devices 6a and 6b.